Upgraded to SSD now network doesn't get identified

I upgraded a Dell Optiplex 7020 with a Samsung SSD. Now when I boot the network doesn't get identified until I restart the NLA. I even tried a clean install of Windows 10 Pro and still no joy.
If I set it to DHCP it will take about a minute to identify after rebooting but with a static IP i just get unidentifed network.
I have tried removing it from the network and adding it back.
Adding the domain name in the network settings.
It seems as though the PC just starts faster and the network card can't keep up. Have tried with a different Optiplex 7020 and a Kingston SSD but have the same symptoms.
Really starting to great my balls as it has been three days of not getting anywhere.
Anyone else had this problem and solved it?

I may be misunderstanding, but if you can duplicate the issue on another computer, then I would start looking at the network itself. It's possible the network is slow, or the router/endpoint isn't configured properly (or may need to be reset).

However, being that both computers would have the identical network card, it could be a driver issue, if you are able to see that both are using the same driver version. Try updating, or getting the drivers right from the manufacturer of the card, such as Intel, Realtek, etc.

Finally found the issue. The switches have been set up as Spanning Tree (no idea why). So once I enable FastLink on the Netgear switch ports (or PortFast as it is also known) the network comes up almost instantly.